21223220232 has 16 divisors (see below), whose sum is σ = 53058050640. Its totient is φ = 7074406736.

The previous prime is 21223220209. The next prime is 21223220243. The reversal of 21223220232 is 23202232212.

It is a junction number, because it is equal to n+sod(n) for n = 21223220199 and 21223220208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442150398 + ... + 442150445.

It is an arithmetic number, because the mean of its divisors is an integer number (3316128165).

Almost surely, 2^21223220232 is an apocalyptic number.

It is an amenable number.

21223220232 is an abundant number, since it is smaller than the sum of its proper divisors (31834830408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223220232 is a wasteful number, since it uses less digits than its factorization.

21223220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884300852 (or 884300848 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21223220232 its reverse (23202232212), we get a palindrome (44425452444).

The spelling of 21223220232 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty thousand, two hundred thirty-two".